Representing Images

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9 Terms

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What is a pixel?

Smallest unit of an image, that can be displayed and edited, each with its own individual colour stored in a series of binary digits

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What is resolution?

the quality of an image, determined by the number of pixels, the higher this is the greater the quality

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Effect of resolution on file size

Higher the resolution, the greater the number of pixels, and therefore too the file size

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Typical bits per pixel (JPEG)

24 bits

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How are bitmap graphics stored?

Stored as a grid of pixels, with each pixel assigned a specific color value and can also be compressed

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How are vector based graphics stored

Stored as mathematical instructions to create shapes and lines.

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Difference between bitmap and vector based graphics

Bitmap uses pixels and loses quality when resized while vector uses equations and scales without loss of quality.

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Formats for bitmap graphics

  • .bmp

  • .dib

  • jpeg

  • gif

  • tiff

  • .png

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Fromats for vector based graphics

  • .svg

  • .cgm

  • .odg

  • .eps

  • .xml